Объяснение:
(а-7)(а+7)=а²-49
(х+3)(х-3)=х²-9
(3m+6)(3m-6)=9m²-36
(9х+1)(9х-1)=81х²-1
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Объяснение:
(а-7)(а+7)=а²-49
(х+3)(х-3)=х²-9
(3m+6)(3m-6)=9m²-36
(9х+1)(9х-1)=81х²-1